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    <meta charset="UTF-8">
    <title>绝对定位</title>
    <link href="css/css_07_绝对定位.css" rel="stylesheet">
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<div class="d1">
    <div class="d2">d2</div>
    <div class="d3">d3绝对定位，从文档流html脱离，相对父容器做的偏移</div>
    <div class="d4">d4</div>
</div>
</body>
</html>